Hong Kong pro-democracy protesters take to the hills to form flashlight-carrying human chains during the Mid-Autumn Festival, a day when families traditionally gather to gaze at the moon and eat mooncakes while children swing colorful lanterns.

Southeast Asia has suffered for years from annual bouts of smoke caused by slash-and-burn clearances of forests for farms and palm oil plantation land, raising worries about public health and the impact on tourism.

An unprecedented surge in wildfires has occurred since Brazil's right-wing President Jair Bolsonaro took office in January vowing to develop the Amazon region for farming and mining, ignoring international concern over increased deforestation.